.instr_list{
	position: absolute;
	width: 150px;
	height: 200px;
	top: 100px;
	left: 0px;
	background-color: DarkSeaGreen;     /* 颜色可调 */
	opacity: 0;
	border-radius: 10px;
}
.list_content{
	position: absolute;
	top: 10%;
	left: 0%;
	font-size: 20px;
}
.l1:hover{
	background-color: MediumSeaGreen;        /* 颜色可调 */
}
.l2:hover{
	background-color: MediumSeaGreen;        /* 颜色可调 */
}
.l3:hover{
	background-color: MediumSeaGreen;        /* 颜色可调 */
}
.instr_content{
	position: absolute;
	background-color: LightSteelBlue;        /* 颜色可调 */
	opacity: 0;
	width: 750px;
	height: 850px;
	top: -800px;
	left: 650px;
	border-radius: 10px;
}
.article_title{
	position: absolute;
	font-size: 30px;
	font-weight: bold;
	left: 300px;
	top: 3%;

}
.article_content{
	position: absolute;
	resize: none;
	background-color: LightSteelBlue;        /* 颜色可调 */
	width: 85%;
	height: 90%;
	top: 60px;
	left: 10%;
	border: none;
	font-size: 20px;
	outline: none;
}